Improved punch



`UNITED STATES PATENT OFFICE.

NEW YORK, N. Y.

lMPROVED PUNCH.

Specification forming To all 'whom it may concern:

Be it known that we, MICHAEL J. FrrZrA'rmor; and BENJAMIN BARKER, ol' New York city, in the county and State oil New York, are thejoint inventorsofa new and uset'ul Machine for Punching Rivet-Holes in Steam-Boiler and other Iron Plates, and we do hereby declare that the following is a full and'exact description ot the construction and operation of the saine,rei'erence being had to theannexed drawings, making a part of this specification, in which- Figure l is a perspective view ofthe Little- Giant Funch,77 in which Arepresents the body or stock ot" the punch; 13, a portion of the main screw, (J,the punch; D,the die; E,the worinwheel; F, the wornrscrew; G, the square end ot' the worin-wheel shaft upon which the pawlwrench is applied; H, thc eccentric-box; I I, the pins which work the eccentrics.

Fig. ll represents the main screw and punch, in which U is the punch, which is heldin the screw by n steady-pin which allows it to turn in the screw B, thc portion ol' the screw which is iiatteneu or cut oft' on two sides to prevent its turning in the wornrwhcel; J, the top end, which is square, in order that the pawlwrench may tit upon it.

Fig. Ill is a Vertical view ofthe worin-wheel, in which K is the opening through which the main screw passes.

Fig. IV is a top view ot' the worm-screw shaft with the eccentrics connected, in which F represents the worin-screw; M M, the thin bands which pass around the shaft, the ends being secured to the eccentric-boxes H H for the purpose of drawing the worm-screw out of gear with the worin-wheel; L L, the eccentrics, Gr G, the ends ofthe shaft to which the wrench is applied.

Fi. V is a perspective view wrench. L

rlhe operation of our punch is as follows: Place the edge ot' the plate to be punched in the jaw of the punch, so that the punch may be directly over the point desired to pert'orate. The eccentric-pins being turned forward to oi' the pawlthrow the'worni screw and wheel into gear, apply the pawl-wrench to the end of the worinpart of Letters Patent No. 49,616, dated August 29, )$65.

screw shaft. By turning the shaft the wormscrew, working in the gear of the worin-wheel, causes the wheel to revolve. -As the opening in the wheel corresponds in size and shape to the outline ot' the iuttened portion ot' the main screw which passes through it, the wheel operates as a wrench upon the screw, and as the 'screw advances into the stoel; it passes down through the wheel, at the same time. revolving in unison with the wheel.

The advantage of our invention is the power gained in connection with the limited space required in which to operate the machine. rlhe power gained by our invention is such that a person exerting a force of i'ty pounds upon the end ot' the pawl-wrench (it being eighteen inches in length) will press one hundred and eighty-three tons and twelve hundred pounds upon the punch, allowing nothing for friction.

Allowing one-halt' for friction, the power exerted on the punch would be ninety-one tons and sixteen hundred pounds. Bythe use ot' the. pawl-wrench the machine can be operated in a limited space inside the boiler, without the inconvenient necessity ot' taking oft' the wrench at each turn, asin other machines for the purpose. By the arrangement of the worin-screw shaft the wrench can be applied on either side, so that the punch can be used close up to either side of the connections inside the boiler', where other punches cannot he used. The advantage ot' the punch being held in the main screw by the catch-pin is that the punch does not revolve while passing through the plate, and consequently does not wear out so tast at the edge asif it turned with the screw. It is also easy to remove the punch by taking out the pin in case it is desired to put in a new one or one ot' a different size. The opening in the die is made a little larger than the punch, so that it may not bind the plug or the punch as it passes in and out. The object of the eccentrics is to throw the worm screw and wheel out of gear after the iron is punched, in order that by applying the pawl-wrench to the top of the main screw it may be turned up in less time than it' it were done by means of the wormscrew.

Having thus described the construction and operation of our punch,what We claim as novel, and main stock, substantially as and for the and desire to secure by Letters Patent, ispurpose set forth..

l. The bauds surrounding the Worm-screw shaft, and connected to the eccentric-boxes in TZPATRICK the combination, as and for the purpose speci- J fled. Witnesses:

2. The combination yof the Worm -screw and. DARIUS GOBT, Wheel, the flattened main screw, the eccentrics, GEO. S. WENDELL. 

